Insect & Disease ID And Diagnosis Guide: Infestations

Edema and webbing are clues to heavy spider mite infestation on this ivy geranium.

Sooty mold and cast skins on this celosia leaf indicate the presence of aphids. Sooty mold is a harmless fungus that grows on honeydew from aphids or other insects with piercing or sucking mouthparts.

Flecking on this poinsettia (the leaf on the left) indicates the presence of Lewis mite.

Yellow and dry brown patches on lower leaves of geraniums indicate spider mite feeding.

Long-legged cast skins on this mum are evidence of an aphid infestation.

Verbena foliage fed on by thrips shows white scratched patches…and the culprits themselves!